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Definition of brown earth in US English:

brown earth

noun

Soil Science

A type of soil having a brown humus-rich surface layer.

‘Brown earths cover 45% of the land in England and Wales.’

‘Brown earths are mostly located between 30° and 55° north of the Equator.’

‘Brown earths have the second highest primary productivity of all soils, second only to tropical soils, the difference between them resulting from the winter season when deciduous trees are virtually dormant and the colder weather inhibits growth.’